Well, my K-12 Lutheran school didn’t make any bones about it, the war was about Slavery. The 10th amendment only applied because the south thought the 10th amendment allowed them slavery.
Now I like the 10th amendment and would like to see the Federal government weakened by repeal of certain provision of the 17th amendment, which would strengthen ‘States Rights’.
But lets be real here, Neither Slavery nor Abortion are 10th amendment issues. It’s just common decency.
The teachers that fed you that BS did you no favors.